Gun-slinging evil-doers beware. Scientific justice is just around the corner thanks to a new nanotechnology system that not only better captures DNA on guns, but attaches hard-to-remove, microscopic tags to the hands and clothing of criminals who fire their weapons. Developed in the U.K., the tags are a unique blend of naturally-occurring pollen, known for its extraordinary adhesive properties, and nanotechnology particles. The composition can be used as an abrasive coating to capture skin cells on gun cartridges, usually too smooth or shiny to retain much evidence in the way of fingerprints or DNA. The tags in the coating also transfer themselves to anyone handling the cartridges and are very difficult to wash off.